Barometer.



F. E. COLLINSON.

BAROMETER. APPLICATION FILED Aus. l2', 1914.

l ,206,094. Patented Nov. 28, 1916.

UNITED sTATEs PATENT OFFICE.

FRANCIS E. CoLLINsON, or LONDON, ENGLAND, `A'ssIGNOR OFv ONE-HALL` To TAYLOR Y INSTRUMENT COMPANIES, or ROCHESTER,- NEW YORK, A CORPORATION or NEW YORK BAROMETER Application'led August 12, 1914. Serial No. 856,322.

To all 'whom it may concer/n:

Be it known that I, FRANCIS E. COLLIN- soN, of London, England, have invented certain new and useful Improvements in Barometers; and I do hereby declare the following to be a full, Clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the reference-characters marked thereon.

My invention has for its object to improve the construction of aneroid barometers, in

order to ai'ord means for more readily reading the instrument and determining the character of the weather, as indicated by the position of the indicator or hand upon the dial.

More particularly, the invention contemplates the provision of a novel form of supplemental index that is manually adjustable with relation to the indicator and can be set at any position of the indicator in order to subsequently show the movement of the indicator Vfrom said position, and also the condition of weather that would usually result in or follow such a position of the indicator.

To these and other ends the invention consists of Certain improvements and combinations of parts all as will be hereinafter more fully described, the novel features being pointed out in the Claim at the end of the specification.

In the drawings: Figure 1 is a plan view $5 of a barometer constructed in accordance with my invention, and Fig. 2 is a sectional view on the line 2L- a of Fig.i1.

Similar reference characters throughout the several figures indicate the same parts.

In the embodiment of the invention shown, A designates the casing within which iscontained the operating mechanism, such as generally employed in this type of device.

B designates a dial which is preferably stationary, although it may be otherwise arranged within the casing, and provided with the usual barometer indications. Coperating with the dial B is an'indicator C which is suitably connected and controlled by the operating mechanism contained within the casing, as usual in barometer construction.

It is desirable tobe able to ascertain in connection with any reading, the direction and extent of movement of the indicator from its position when the last previous Specication of Letters Patent.

Patented Nov. as, 1916.

reading wastaken and this is generally ac.-

complished by means of a supplemental hand that is manually adjustable and can be positioned so as to coincide with the mechanism controlled indicator.

According to my present invention, in-

stead of employing a hand or similar indicator, I make use of an index plate that'is rotatable with relation to the indicating dial. Preferably, the index plate is of circular formation 'as indicated at D, although the plate may be otherwise constructed and it maybe cut away to afford open portions E on either side of a central strip F, by which it is secured in position. The casing isfprovided with a transparent cover G preferably of glass which is held in place by means of the bezel II, the cover G being provided with a central opening to receive the 'rotatable arbor I. The index plate is iXedly mounted at the inner end of the arbor I, being disposed preferably between the cover G and the dial, and may be turned in opposite directions by means of a knurled head J provided on the arbor I.

The index plate D carries an indication K, arranged at one edge and adapted to be brought into alinement with the indicator C as shown in Fig. l, to show the extent of movement of the indicator when it has been operated, for example, to the position shown vided with various weather indicia on opposite sides of the indicator K as for instance an arrow pointing to the right, on

yone side, together with the words Rising lthe wordsor descriptive matter extending and reading circularly with respect to the axis of the index plate. One of the advantages of such a construction lies in the rapidity and ease with which an instrument can be read correctly. For instance, with the index plate in the position shown in Fig. 1 and with the indicator in the position shown in dotted lines, it is immediately apparent to the observer that the indicator calls for falling weather with the probability of increased winds or wet^weather and in this mannerthe descriptive words showing the character of weather to follow are always immediately over the indicator and in'dotted lines. The index plate also is pro- Y 'ditions. Theindex plate can, of course, be provided l'withy additional instructive data that will'assist the user in understanding the operation of the instrument, and the' essential feature cfg/my inventionr'resides in having such des iptive data arranged on an index plate that is movable and carriesv a supplemental indication that can be brought to coincide with any position of the indicator.

Y I claim as my invention:

A barometer comprising a stationary dial and a movable indicator, an annul ar or ringlike index plate rotatable \with relation to n said dial and provided on its face with weather indiciav extending or reading cir-v cularly ofthe axis of the index plate,'the

indicator being visible beyond the outer edge and Within the inner edge of the index plate. Y

" FRANCIS E. coLL'INsoN.

Witnesses:

H'. D. JAMESON, O. J. WORTH. 

